Exam 5: The Structure and Function of Large Biological Molecules

The molecular formula for glucose is C₆H₁₂O₆. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions?

Which of the following statements is true about proteins?

How do phospholipids interact with water molecules?

In sickle-cell disease, as a result of a single amino acid change, the mutant hemoglobin tetramers associate with each other and assemble into large fibers. Based on this information alone, we can conclude that sickle-cell hemoglobin exhibits ________.

Starch and cellulose ________.

What is the major structural difference between starch and glycogen?

Which of the following statements is true for lipids?

When nucleotides polymerize to form a nucleic acid, ________.

The following question is based on the 15 molecules illustrated in the figure. Which of the following molecules is a purine nitrogenous base?

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. What is the significance of this finding?

What makes lipids/fats hydrophobic?

Which of the following is a major difference between RNA and DNA?

The difference between an aldose sugar and a ketose sugar is ________.

Which of the following provides the information necessary to stipulate a protein's 3-D shape?

You would like to lose weight. Which of the following should be your preferred food group?

Misfolding of polypeptides is a serious problem in cells. Which of the following diseases are associated with an accumulation of misfolded polypeptides?

Which parts of the amino acids X and Y are involved in the formation of a peptide bond? X-Y

Use the following information to answer the question. "The native structure of hemoglobin (Hb)comprises of two α and two β subunits, each of which carries a heme group. There appear to be no previous studies that report the in-vitro folding and assembly of Hb from highly unfolded α and β globin in a 'one-pot' reaction. One difficulty that has to be overcome for studies of this kind is the tendency of Hb to aggregate during refolding. This work demonstrates that denaturation of Hb in 40% acetonitrile at pH 10.0 is reversible." (J Am Soc Mass Spectrum 2007, 18, 8-16) Hemoglobin, when subjected to 40% acetonitrile at pH 10.0, loses its quaternary structure, which means the ________.

Humans can digest starch but not cellulose because ________.

Use the following figure to answer the question. The chemical reaction illustrated ________.